Lanthanum diiodide

Lanthanum diiodide
Identifiers
CAS Number	19214-98-3;
3D model (JSmol)	Interactive image;
	InChI InChI=1S/La.2HI/h;2*1H/q+2;;/p-2 Key: UYZZZMCZZNTWGP-UHFFFAOYSA-L;
	SMILES [I-].[I-].[La+2];
Properties
Chemical formula	I2La
Molar mass	392.71441 g·mol−1
Appearance	blue-black solid
Density	5.46 g/cm−3
Melting point	830 °C
Related compounds
Other cations	cerium diiodide; praseodymium diiodide
Related compounds	lanthanum(III) iodide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Lanthanum diiodide is an iodide of lanthanum, with the chemical formula of LaI₂. It is an electride, actually having a chemical formula of La³⁺[(I⁻)₂e⁻].^[2]

Preparation

Lanthanum diiodide can be obtained from the reduction of lanthanum(III) iodide with lanthanum metal under a vacuum at 800 to 900 °C:^[3]

La + 2 LaI₃ → LaI₂

It can also be obtained by reacting lanthanum and mercury(II) iodide:^[3]

La + HgI₂ → LaI₂ + Hg

It was first created by John D. Corbett in 1961.^[4]

Properties

Lanthanum diiodide is a blue-black solid with metallic lustre, which is easily hydrolyzed into the iodide oxide.^[3] It has a MoSi₂-type structure, with the space group I4/mmm (No. 139).^[5]

References

^ ^a ^b ^c Holt Jr., Smith L. (1983). Inorganic syntheses. Volume 22. New York. p. 36. ISBN 978-0-470-13288-3. OCLC 86223480.{{cite book}}: CS1 maint: location missing publisher (link)
^ Holleman, Arnold F.; Walter de Gruyter GmbH & Co. KG (2017). Anorganische Chemie Band 2. Nebengruppenelemente, Lanthanoide, Actinoide, Transactinoide (in German). Berlin. p. 1789. ISBN 978-3-11-051854-2. OCLC 968134924.{{cite book}}: CS1 maint: location missing publisher (link)
^ ^a ^b ^c Brauer, Georg (1963). Handbook of Preparative Inorganic Chemistry V1. Burlington: Elsevier Science. p. 1081. ISBN 978-0-323-16127-5. OCLC 843200092.
^ Jungmann, Angelika; Claessen, R.; Zimmermann, R.; Meng, Ge; Steiner, P.; Hüfner, S.; Tratzky, S.; Stöwe, K.; Beck, H. P. (1995). "Photoemission of LaI2 and CeI2". Zeitschrift für Physik B. 97 (1). Springer Science and Business Media LLC: 25–34. Bibcode:1995ZPhyB..97...25J. doi:10.1007/bf01317584. ISSN 0722-3277. S2CID 124057481.
^ Riedel, Erwin; Janiak, Christoph; Meyer, Hans-Jürgen (2012). Riedel, moderne anorganische Chemie (in German). Berlin: De Gruyter. p. 240. ISBN 978-3-11-024900-2. OCLC 781540844.

[Smith_L._Holt-1] Holt Jr., Smith L. (1983). Inorganic syntheses. Volume 22. New York. p. 36. ISBN 978-0-470-13288-3. OCLC 86223480.{{cite book}}: CS1 maint: location missing publisher (link)

[2] Holleman, Arnold F.; Walter de Gruyter GmbH & Co. KG (2017). Anorganische Chemie Band 2. Nebengruppenelemente, Lanthanoide, Actinoide, Transactinoide (in German). Berlin. p. 1789. ISBN 978-3-11-051854-2. OCLC 968134924.{{cite book}}: CS1 maint: location missing publisher (link)

[brauer-3] Brauer, Georg (1963). Handbook of Preparative Inorganic Chemistry V1. Burlington: Elsevier Science. p. 1081. ISBN 978-0-323-16127-5. OCLC 843200092.

[DOI10.1007/BF01317584-4] Jungmann, Angelika; Claessen, R.; Zimmermann, R.; Meng, Ge; Steiner, P.; Hüfner, S.; Tratzky, S.; Stöwe, K.; Beck, H. P. (1995). "Photoemission of LaI2 and CeI2". Zeitschrift für Physik B. 97 (1). Springer Science and Business Media LLC: 25–34. Bibcode:1995ZPhyB..97...25J. doi:10.1007/bf01317584. ISSN 0722-3277. S2CID 124057481.

[Christoph_Janiak,_Hans-Jürgen_Meyer,_Dietrich_Gudat,_Ralf_Alsfasser-5] Riedel, Erwin; Janiak, Christoph; Meyer, Hans-Jürgen (2012). Riedel, moderne anorganische Chemie (in German). Berlin: De Gruyter. p. 240. ISBN 978-3-11-024900-2. OCLC 781540844.

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